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SPE Blueprint?

Personally I am going with a UQ for my rig but my friend insists on using her pad to keep weight down so I decided I would make her a SPE. SO far all the designs I have found do not give any sort of schematic for how to lay one of these out. This is only my second DIY project so still need lots of guidance. Anyone willing to share how they made on of these? I am thinking king of a 4x4 but not sure how to go about making one. Just Jeffs instructions were a little unclear to me, granted I have no idea what I am trying to do.

Was not fully awake when I answered your post the other day, I did not see your last sentence. Basically, an SPE is a piece of fabric folded and sewn into three tubes, one for your main pad, the other two to hold narrow pads to provide insulation over a wider area under you.